Lanterns

Later, fireflv oxyluciferin was successfully synthesi2ed (403. 408) and has been isolated and identified in firefly lanterns (luciola cruaciata) after the lanterns were treated with pyridine and acetic anhydride to prevent decomposition (409). In 1972, Suzuki and Goto firmly established that oxyluciferin is involved in the bioluminescence of firefly lanterns and in the chemiluminescence of firefly luciferin (403. 410).. A. mechanism involving a four-membered ring cyclic peroxide has been proposed for the reaction (406. 411). However, it was not confirmed by 0 -labelinE experiments (412). 

An effective auxiliaiy device frequently used with packing and rotary shafts is the seal cage (or lantern ring), shown in Fig. 10-110. The seal cage provides an annulus around the shaft for the introduction of a lubricant, oil, grease, etc. The seal cage is also used to introduce liquid for cooling, to prevent the entrance of atmospheric air, or to prevent the infiltration of abrasives from the process liqmd. 

FIG. 10-110 Seal cage or lantern ring. (Couttesij of Crane PacJdng Co. )... 

FIG. 11-36 (Continued) Heat-exchanger-component nomenclature, (f) Exchanger AUth packed floating tube sheet and lantern ring. Type AJ V. (Standard of Tubular Exchanger Manufacturers Association, 6th ed., 1978.)... 

The lantern ring performs three basie hinetions ... 

Oil, water, grease, or any liquid or substance compatible with the tluid are forced under pressure into the paeking through the lantern ring by means of a connection on the stuffing box wall to provide these three hinetions. 

Rgure 3-14. Rod packing box. Lantern rings in packing provide space into which a buffer may be injected to aid in sealing. Courtesy of Dresser-Rand)... 

Labyrinth piston, 49 Labyrinth seal leakage, 532 Lantern ring, 74 Lapping block set, 335 Lateral critical speeds, 384 Leakage, seal, 532, 533, 534 Leland-Mueller rule, 26 Lift coefficient, 226 Liquid... 

A number of bridged crown ethers have been prepared. Although the Simmons-Park in-out bicyclic amines (see Sect. 1.3.3) are the prototype, Lehn s cryptands (see Chap. 8) are probably better known. Intermediates between the cryptands (which Pedersen referred to as lanterns ) and the simple monoazacrowns are monoazacrowns bridged by a single hydrocarbon strand. Pedersen reports the synthesis of such a structure (see 7, below) which he referred to as a clam compound for the obvious reason . Although Pedersen appears not to have explored the binding properties of his clam in any detail, he did attempt to complex Na and Cs ions. A 0.0001 molar solution of the clam compound is prepared in ethanol. The metal ions Na and Cs are added to the clam-ethanol solutions as salts. Ultraviolet spectra of these solutions indicate that a small amount of the Na is complexed by the clam compound but none of the Cs . 

One of tlie most legendary disasters occurred in Cliicago in October 1871. Tlie "Great Cliicago Fire," as it is now known, is alleged to liave started in a bam owned by Patrick O Leary, when one of liis cows overturned a lantern. The O Leary house escaped unlianned, since it was upwind of tlie blaze, but tlie bam was destroyed as well as 2124 acres of Chicago real estate. 

Drilling, m. triplet (Mach.) lantern, -salz, n. triple salt. 

Latemen-bild, n. lantern slide, -ofen, m. a lantern-shaped oven made by winding resistance wire arotmd a frame of porcelain rods. 

Charlestown to Lexington, Massachusetts, to warn Samuel Adams and John Hancock that British troops were coming to arrest them. The prearranged signal, which began his historic ride, was based on the placement of lanterns in the bell tower of Christ Church in Boston. Two lanterns were hung to indicate that the redcoats would come by sea rather than by land the latter would have been signaled by one lantern. 

Lantern Gland Stuffing Box Gland Figure 3-17. Packed stuffing box. (Courtesy Dean Brothers Pumps, Inc.)... 

---