1851 Great Exhibition: Official Catalogue: Class VI.: D. Napier and Son
158. NAPIER, D. SON, Lambeth - Inventors and Manufacturers.
A captain's patent registering compass. This instrument registers on paper the exact compass course which a vessel has been steered for 24 consecutive hours. Its object is to enable the captain at any time, by mere inspection, to ascertain if the ship has been steered correctly, and if not, to show immediately the period and amount of the deviation.
Letter-press perfecting and printing machine, worked by a small steam engine; when in operation, it is arranged with a combination of tapes and grippers, by which the "flying" of the sheet in laying on, required in tape machines, is rendered unnecessary.
Another machine, of the same description, for a larger form.
Single cylinder letter-press printing machine, suitable chiefly for bookwork.
Patent self-feeding and self-discharging centrifugal apparatus suited to the separation of the molasses from the crystal in sugar manufacture, also to other purposes. Exhibited as a novel and useful invention. The advantages are, a continual discharge and supply of the matter to be operated upon; and, consequently, great saving of time and labour; as the machines presently used must be stopped, discharged, and re-discharged by men in attendance. The time saved by the improved machine not only includes that now consumed in taking out and filling the charge (which, on an average, must be done every eight minutes), but that necessary for stopping and starting the machines, the working speed being 1500 revolutions per minute, and which is very considerable. There are many other advantages which might be named, such as its suspension, whereby the vibrations consequent upon the excessive speed of the machine are not transmitted to the building, the simple and efficient means of liquoring, etc.