The Spon Lane Lighthouse Works have been extended greatly since the last visit of the Association. The unique methods of grinding and polishing the optical glass have not been materially changed, but the number and variety of machines have been largely increased. In the mechanical shops there is now a complete _outillage_ for turning, drilling, shaping, screwing, &c., applicable to all the old designs and processes, and also the newer branches introduced since 1865. There are about 200 workpeople employed, many with consummate skill and intelligence, as may be assumed from the precise and highly finished work in which they are engaged. At this date about 260 complete sea lights and about 300 complete harbour lights have been sent out, together with about 200 smaller port lights and about 370 of the recently designed ship lights. Very striking specimens of optical science have been contributed by Messrs. Chance, as exemplified in the list of dioptric lights they have supplied around our own coasts, of which The Longships, the Wolf Rock, the Flamborough Head, the Hartland Point, the Start Point, the South Stack Rock, The Casquets, Bull Point, Anvil Point, the Eddystone, and many others are examples. Mr. Kenward will be glad to give further information to any member of the Association who may take an interest in the subject. =Locks and Lock Making.=--[J. C. TILDESLEY.]--(B. 77.) The price of cheap padlocks is still lower. Iron padlocks of the cheapest class are now being made in this district (Willenhall) and delivered free in Bombay and Calcutta, at _fivepence halfpenny per dozen_! In reference to the table (B. 89), the number of employers may be set down as 100 less (that is 350) and at least 1,000 must be deducted from the total number of workpeople, bringing it to about 3,950. The production of locks in the district may now be computed at 25,000 dozens per week, as against 31,500 dozens per week, as estimated in 1865. The reductions being chiefly in the pad, cabinet, chest, and till departments, which are being driven hard by America and continental competition. On the other hand, door locks (rim, dead, mortice, and drawback) are being made in larger quantities than ever, and are being sold at prices which would have been regarded as fabulous twenty years ago.