英國土木工程師學會（Institution of Civil Engineers / ICE）典藏一批「韓得善檔案」，包含二份韓得善到英國廠驗鵝鑾鼻燈塔的檢查報告，在此僅為轉錄，此為其二。
South Cape of Formosa Light and Lantern
Inspection Report, 2nd December 1882.
1. Light
Quality of Glass
Some of the lenses and prisms are very stringy, and air bubbles and seeds are to be met with. There are very few chipped edges. One large chipped edge was observed but the defective prism is to be replaced. Some prisms were too short, and I pointed out prisms Nos 14 & 17 in upper panel 1-2 that did not at one edge. Enter the provided for their support. All short prisms are to be replaced.
Setting of Glass
The whole of the lower prisms have through an error, been set to a wrong focus, and they are being reset. I examined each prism of the panel 1-2 of upper prisms and found the setting satisfactory. The lens panel 1–2 was examined in detail by Dr. Hopkinson and myself and our readings of the positions of the various foci agree. As the flame is large this panel will give a good light but it is far from perfect, and with the present lens rings, it cannot be improved. The edges of some of the prisms bore upon or were too close to the metal racks; the jars of transport are almost certain to chip the corners of such prisms. Dr. Hopkinson is to thoroughly re-examine the light next week and see that short prisms are replaced and that glass is not bearing direct on brass. Mr. Kennard remarked that the light was a fair specimen of their manufacture.
Foci
The Focal Plane is 3.9 (inches) above the horizontal lens centre. The top of the Douglass burner is 32 (inches) below the focal plane, and cross strings indicate this position. The focus for the lenses is where the vertical axis of light intersects the Focal Plane. The focus for the upper prisms is in the Focal Plane and 25 in. behind the vertical axis. The focus for the lower prisms, when reset, will be 20 (inches) below the Focal Plane and 70 (inches) in front of the vertical axis.
Lamps
None of the lamps or burners were ready. It will take about a fortnight to finish the fountain lamps. It was explained that Sir James Douglass has not yet definitely settled the pattern of his burner and that till he has done this the burners cannot be put in hand. I suggested that two ordinary Spirit House pattern burners be made at once to go with the Light in order that there may be no delay in its exhibition. The Douglass burners with the necessary chimneys can follow as soon as they are ready. The top of the Spirit House burner should be placed 19 (inches) below Focal Plane, and the top of the burner tips 30 (inches) below Focal Plane, or 1 (inches) higher than the level of the adjusting strings.
Dioptric Mirror
The centre of the mirror has been placed 23 (inches) above the Focal Plane. The Messrs. Chance tendered for and supplied their ordinary mirror with 10 totally reflecting prisms. I specified for a mirror with 11 prisms because I wished to avoid glass touching glass as occurs in the centre of the mirror supplied. The French Lighthouse Engineers and Manufacturers agree with me on this point. I am aware that the Messrs. Chance have saved themselves trouble and expense by supplying their pattern mirrors. We have in China the pattern of mirror specified for and I did not want a second one introduced unless it were an improvement.
Armature
The inclined strap at the back of mirror had not been supplied but they were to be put in hand.
Pedestal
The pedestal was satisfactory and the holding-down bolts for it are in hand.
2. Lantern
Quality
The quality of the materials and workmanship was generally good and I specially pointed out the importance of having the screws long enough and large enough for their respective holes. One roof plate had a scab on its upper surface which was to be held down by a couple of rivets. I did not reject the plate as long as doing considerable delay would have resulted.
Astragal Bolts
Ordinary bolts and nuts were supplied to secure the astragals to the standards, but I arranged that screws with countersunk heads are to be supplied as thereby light is saved and the correction looks neater.
Exterior ladder
I had this ladder placed so as to occupy the least possible room and not interfere with the working of the Gatling guns.
Downpipe
I had the position of this pipe slightly altered at the bottom of lantern glazing so as not to obstruct light.
Glazing
Intended only three sizes of panes to be used, but, through an error, larger panes are required at each side of the dark arc. There will now be six different sizes of panes. Nine spare panes of the ordinary sizes are provided, and three spare panes of the special sizes near dark arc.
Cowl
To render the cleaning of cowl easier I have had a second hand-hole made in it and another step bolted to roof of lantern.
3. Stores
50 glass chimneys are to be supplied for the Trinity House Burners and 100 are to be supplied for the Douglass burners. Lamps with duplex wicks and glass reservoirs were provided for the keepers' rooms. I pointed out that the reservoirs must be of brass as glass ones were so easily broken. A single wick lamp is sufficient. The tine for the whitening and rouge were in hand. As two patterns of burners are to be supplied four drawings of flames are required, one of each kind to be sent with the Light and one of each kind to be sent to the Engineer's Office Shanghai. The bidons and stands supplied were not of good design so I explained what was wanted. The standard barometers had not been tested as there was some difficulty about getting this done.
Time of Completion
The whole was to be packed and ready for delivery within three weeks from the date of my first inspection on the 24th November. I finished the inspection on the 27th November, and on this date a portion of the lantern had been taken down and painted.
Charing Cross Hotel,
London, 1st December 1882.
David M. Henderson,
Engineer-in-Chief.
N.B. Handed in sketch of Chance's mirror and the one I specified for with explanation. No copies kept.
D.M.H.
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